Diaphragm-horn.



Patented Mar. 9,

2 SHEETS-SHEET 1.

gnu@ l my;

M. R. 'HUTGHISONl DIAPHRAGM HORN.

APPLICATION FILED MAY 11, 1911. jupj SSQSQ Patented wl. 2 SHEETS-SHEET2.

leunen annee nnrcnrson, et Waar oefenen, New reussir, assisteren. *reammira, arqconnnm tienerac'runrnecoraranr, ,a 'coaronarron or benamrane,

matrassen-nenn,

mareas.

`Diaphraigm-Horns, of which theltellowing is a specification.

This invention relatesto thatleind et mwechanically actuated diaphragmAhorns in which the diaphragm is -vibratcd bodily by high speedmechanism, such as a shaft or ro tary member driven by an electric4motor and provided with an eccentric portion or cam faces adapted totransform rotary into' reciprocatory movement.

lnmy cri-pending application Serial No. 626,487, filed May 11,'l5lll, lhave described various'useful features oi design and operation forsecuring cushioned actuation'oithe diaphragm, referring moreparticularly to different formsof diaphragm-coupled cushioning membersfor partially absorbing and partially transmitting the efforts exertedby the rotary driver. The constructions and arrangements forming thespecial subjectmatter of this application are illustrated and describedin my said application as coming Within the broad scope thereof, and

one form of construction shown herein and covered by the appended claimis shown and described, but not specifically claimed, in my priorapplication Serial No. 494,688,

`led May 7, 1909, namely the form of signal employing a hollow cylinderof springI steel as a thrust member between the rotary driver and thediaphragm.

The object of this invention is to provide a non-rigid member betweenand separate from the rotary driver and diaphragm for receiving thethrust or impact from the former and transmitting the impulse to thelatter in a more or less yieldingY manner. Preferably the member is soconstructed and arranged as to yield at each normal effort' eX- vertedby the driver, so as to absorb part of the power during the irst part.of the duration of the thrust and thereby cushion the action and temperthe impact uponthe diaphragm. The possible embodiments of such means arenumerous, but I prefer to con# struct the member Vas a loose connectionmovable in a'guide intermediate the driver and the diaphragm under thealternate actuation thereof.

specification of Klettern 'ire-tent.

ADEl-QMDR filled Maly il., 1811. Seriell No. @$38,459.

- and Fig. 4 is a View like Fig. 53 shot-vir Patented Mar, tina In theaccornpanving drawing', ing the invention: Figure is a in side elevationand partly in. sect horn signal embodying one -form l vention; Fig. 2 isa horizont through the rear part oit the signa a detail view of theconnection in :in

other form of yielding,J1 thrust counsel a.

rhe numeral l indicates the horn er reed hater, carried by theV frontsection 2 el! an, diaphragm case. The diaphragm 3 is held between corkwashers or :the 'like l l marginal clamping portions G, 7 section 2 andthe rear section tl o phragm case. The clamping is screws 9, which passthrough openingH the clamping portions of the case and in the gasketsand the marginal re, et' the diaphragm. 'i

The rear section 8 of the cas receive the rotary driver "i0, n1., as a'disk provided with a pluralitL ripheral cam `projections ll. the axisof this rotary driver paraL the diaphragm, as shown. Suitable means forrotating the driver at high speed is illustrated. in the form of anincaaed e ,ci ir.. motor 12, the armature shaft 13 o"a prolonged intothe rear section olf' phragrn case, there carrying; the rotary driver.The driver is preferably solidly mounted so as to deliver rigid thruststo ti e yieldable 1 or cushioning:r connection. rllhe hearing sleeve i4of the rigid shaft 13 is rigidly held in the rear section et the diakvphragzm ease, and has exterior cylindrical hearing upon the case atlll-, 14h, the airis et' the shaft being eccentric to said cylindrical.hearing surfaces so that rotary adjustment of the sleeve serves toadjust the cam to or from the diaphragm. rlhe yieldable actuan ingconnection' may he positioned in a variety of ways, but the simplestarrangement that shown wherein it is directly interposed hetwoen therotary cam l0 and, 'the diaphragm 3 or a Wear piece or projection lllthereon. Preferably, also, the connection is separate from the diaphragmand the mechanical actuating means, being loosely movable therebetween.

n Figs. l. to 8 the connection or inter `mediate thrust member is* shownas being embodied in the form of a. hollow cylinder parallel to Thisholfuitable stao'ved back titration of ,diese views illustrate the tactthat the diaphragm may,

if desired, he provided with Wear piece lo* for receiving the impulsetrom the inter mediate loose connection. Preferably the said lloose.connection normally contactswvith both the diaphragm and with the camsor projecting portions of the driven part and as' will be seen from Fig.:2, the member and the guides 2O are designed with relerence to theamplitude of possible vihrtn tion of the diaphragm and the depths ot thedepressions between carne so that the guides will engage the member 15and heid the same from lateral displacement throughout the extreme rangeof movement made possible by the cani depressions and the vibration ofthe diaphragm.

ln Fig. 4 the loose cushioningf connection is shown in the form of alongitudinally reciproca-blc plug 15a of iher or other suitableSemi-yielding material, slidahly mounted in a suitable stationary guide20a. This form of device illustrates the fact that a special wear piece:may be dispensed with entirely, the liber member constituting asuflicient Wear piece for receiving the thrusts or' the rotary driverand applying the impulses directly against the .tace of the diaphragm.

In operation, the loose connect-ion is preferably so constituted as toyield somewhat under each normal diaphragmdisplacing eiiort of thedriver. in this way, the

.thrusts are softened or tempered before reaching the diaphragm, so thatthe latter is set in motion or the direction, of its n1otion is changedless abruptly than in those cases Where the diaphraf'm is rigidlydriven.

It will be understood that in all cases I meines prefer to have my abovedescribed loose connection only suliiciently yieldahle to teu1= todecrease the vibration and impair theY volume of sound which isnecessary for an eihcient warning signa-l. Hence, it will be understoodthat the cushioning is preferably such as Wili he suilicient to ahsorhor cushion the concussive eli'ecte of the cam Without seriouslymodifying or impairing the trans mission of positive cam thrusts througha desired range of movement of the diaphragm and While still maintainingthe advoutages of the loud sound producble by .my well known method ofmechanically and positively forcing each outward bodily movement of thediaphragm beyond its nor- .mail position to a predetermined position atsuch velocity as to cause further outward movement of the diaphragm Kinthe same directionhy reason of its inertia and against increasingelastic stress.

I claim: f

In an alarm or signaling device, the Coinbination of a diaphragm, arotor presenting a series of camining projections, high speed means fordriving said rotor, a guide member disposed between said rotor and saiddiaphragm and having an 'aperture therethrough and a looseconcussion-cushioning, p

thrust-transmitting member disposed Within said aperture and adapted toreceive and cushion the thrust from the rotor and apply the impulses tothe diaphragm.

Signed at New York city, in the county of New York, and State or' NewYork, this 9th day of May, A. D. 1911,

-MLLER REESE lHUIOHISONl.

Witnesses:

Invnvo Monrsen'r, .JAMES D. B RDWN.

